An extensive *repetition* of an introductory numerics lecture for undergraduate students (math/physics/computer science): http://numerik.iwr.uni-heidelberg.de/~lehre/notes/ (German). The difficulty level varies from trivial notation conventions or prerequesites to theorems which may appear abstract if you are not used to this kind of math. Teaching of concepts is not intended, just active memorization of terms and passive repetition of formulas. Choose levels according to interests.

Welcome to Memrise!

Join millions of people who are already learning for free on Memrise! It’s fast, it’s fun and it’s mind-bogglingly effective.